Rock-drill.



J. W. SELLEOK & P. G. SHARP.-

ROUK DRILL.

APPLICATION FILED SEPT. 10, 1908.

954,826. Patented Apr. 12,1910.

Swumwtom Wit" Mam K0. @v'zz UNITED s'rn'rns PATENT @FETCE.

JOSEPH W. SELLECK AND FREDERICK C. SHARP, 0F CUBA, WISCONSIN.

ROCK-DRILL.

Specification of Letters Patent.

Application filed September 10, 1908.

Patented Apr. 12, 1910.

Serial No. 452,384.

To all whom it may concern:

Be it known that we, JOSEPH W. Samson, and FREDERICK C. SHARP, citizensof the United States, residing at Cuba city, in the county of Grant andState of \Visconsin, have invented a new and useful Rock-Drill, of whichthe following is a specification.

The objects of the invention are, the provision in a novel andmerchantable form, of a device of the above mentioned class, which shallbe inexpensive to manufacture, facile in operation, and devoid ofcomplicated parts, other objects and novel features of constructionbeing disclosed as the description of the invention progresses.

The invention consists in the novel construction and arrangement ofparts hereinafter described, delineated in the accompanying drawings,and particularly pointed out in that portion of this instrument whereinpatent-able novelty is claimed for certain distinctive and peculiarfeatures of the device, it being understood that within the scope ofwhat hereinafter thus is claimed, divers changes in the form,proportions, size, and minor details of the structure may be made,without departing from the spirit or sacrificing any of the advantagesof the invention.

Similar numerals of reference are employed to indicate correspondingparts throughout the several figures of the drawings.

In the accompanying drawings :Figure 1 shows the invention in verticallongitudinal section; Fig. 2 is a side elevation; Fig. 3 is a top planupon a reduced scale, of the hammer, the housing and guides being shownin cross section, the closure for the top of the housing being removed.

The invention comprises a base-plate 1, which may be of any form.Preferably however, as shown, it is annular in structure, and from itssides rise standards 2, connected at their tops by a cross-piece 3.

The housing 4 may be of any form; as shown it is cylindrical instructure permanently closed at the bottom and provided at its top andbottom with the oppositely disposed arms 5, extending laterally from itsside walls and engaging the standards 2, furnishing a means whereby thehousing 4 is slidably mounted in the said standards. The upper end ofthe housing 4 is provided with a removable closure 35, threaded toengage the housing, and constituting a means whereby access may be hadto the interior of the housing. A threaded member 6 is passed throughthe cross-piece 3 into engagement with the top of the closure 35,furnishing a means whereby the'housing 4 may be slidably adjusted in thestandards 2. The interior of the housing 4 carries the longitudinallydisposed guides 7, upon which is slidably mounted the hammer 8. Thehammer 8 may be of any form, as shown in Fig. 3 it is circular in crosssection and conforms to the interior of the housing 4. The lower face ofthe hammer 8 is provided with an opening 10, circular in cross section,and terminating within the body of the hammer, in an enlarged portion 9.The upper face of the hammer 8 is provided with a flaring opening 12,terminating, within the body of the hammer 8 in an enlarged portion 11.

Rotatably and shdably mounted in the bottom of the housing 4, is adrill-stock 13, carrying a chuck 14, adapted to engage and hold a drill15. The drill stock 13 has a polygonal shank 16, cylindrical in itsupper portion 17, the said portion 17 being rotatably mounted in theopening 10 which is axially disposed in the lower face of the hammer 8.The upper portion of the drill stock 13 is provided with a head 19arranged to register rotatably, and against withdrawal, in the enlargedportion 9 of the opening in the lower face of the hammer. The drillstock is provided with a shoulder 18 arranged to contact with the lowerface of the hammer upon the down stroke thereof. The shoulder 18 is sopositioned as to contact with the lower face of the hammer 8 ashereinbefore pointed out, and this construction serves to distribute theshock incurred by the structure when the drill, in its downwardmovement, strikes the rock.

Transversely mounted in the upper part of the housing 4, is acrank-shaft 20, carrying upon its terminals balance wheels 21 andprovided with the crank 22 located within the housing 4. A connectingrod 23 is provided, having its upper terminal operatively connected withthe crank 22, its lower terminal being provided with a head 24, looselymounted in the enlarged portion of the opening in the top of the hammer11.

Mounted in the housing 4 below the crank shaft 20, is a shaft25,0peratively connected with the drill stock 13 by the beveled gears 26and 27. The stock carried pinion 27, has a polygonal central openingthrough which passes the polygonal drill-shank 16. The stock carriedpinion 27 is slidably mounted upon the shank 16 and is arranged torotate therewith. In order that the reciprocating motion of the drillstock 13, may not break the union between the beveled gears 26 and 27,stops 28 inwardly projecting from the side walls of the housing, areprovided, one disposed above and one disposed below the stock carriedpinion 27. A gear train 29 connects the crank shaft 20 with the lowershaft 25. One of the shafts 30, on which a member of the gear train 29is mounted, is prolonged and provided with a crank 31, or other suitableactuating means.

As will be seen by an examination of Fig. 1, the heads 19 and 24 areadapted to reciprocate to a limited extent in the hammer. By thisconstruction, the cutting action of the drill is divided into threedistinct steps. First, the impact due to the weight of drill and drillstock; second, the impact due to the hammer impinging in its downwardmovement against the shoulder 18 and the head 19; third, the impact dueto the head 24 impinging, in its downward movement, against the hammer,the impact due to the hammer striking the members 19 and 18 precedingthe impact due to the member 24 striking the hammer, so that theycooperate with the initial downward movement of the drill stock ingiving to the drill a compound impact of great cutting efficiency, itbeing recalled that, from the initial to the final impact, the drill isbeing constantly rotated.

The invention is shown as mounted upon a tripod 32, but it is obviousthat any other method of mounting may be employed. The invention may beso mounted as to be adjustable to any angle or, it may be mounted iypona frame-work and used as a quarryc rill.

In practical operation the gear train 29 is set in motion by the crank31 and motion is transmitted to the crank shaft 20. The crank shaft 20,rotating, causes the connecting rod 23 to move upward and downward,rocking in the flaring opening 12, and carrying with it, inreciprocating motion, the hammer 8. The hammer 8, rising, engages thehead 19, and draws the drill. stock 13 up ward. When the down stroke iscommenced, the hammer 8 impinges upon the annular shoulder 18, andforces the drill downward into the rock, the weight of the drill and thedrill stock obviously accelerating the clownward movement of the drill.lVhen the crank shaft 20 completes its revolution, the hammer 8' and thedrill stock 13 are carried upward in a position to begin again thedownward stroke. As the reciprocating motion, heretofore described, isbeing carried on, the shaft 25 is rotated. The beveled gears 26 and 27,transmit this rotatory motion to the drill stock 13, and, as the drillstock 13 is thus rotated, it is, at the same time, subjected to areciprocating motion under the impulse of the hammer 8, as heretoforedescribed. l/Vhen the drill 15 has cut away all the material which liesbeneath its foot, within the limit of its stroke, the threaded member 6may be rotated, moving the housing 4 downward upon the standards 2, thusfeeding forward the drill 15 into a position operative to remove anyfurther material which may lie within its path.

As will appear upon an examination of the drawing, the hammer and mostof the moving parts of the device are mounted within the housing and areprotected thereby against injury from falling rocks and the like. Thetubular form given to the housing results in a structure of greatstrength, well adapted to support the moving parts, which in a device ofthe class described, necessarily produce violent strains within thestructure. \Vhen it is desired to examine the moving parts of thedevice, the closure 35 may easily be removed, the threaded element 6having first been rotated to lift it from contact with the closure.

The threaded element 6, together with the crank which is assembledtherewith, furnishes a means for advancing the housing, and with it, thedrill, toward the rock as the same is worn away, and any suitable andcommon means for retaining the housing in the position to which it hasbeen advanced by the rotation of the element 6, may be provided.

Havin thus described the invention, what is claimed as new is A deviceof the class described comprising a housing; a hammer mounted forreciprocation in the housing and provided in its upper and its lowerfaces with axial openings terminally enlarged within the body of thehammer; a transverse crank shaft ourna'led for rotation in the housingabove the hammer; a connecting rod operatively assembled at one end withthe crank shaft and at the other end provided with a head to rock in theenlarged portion of the opening in the upper face of the hammer, and toreciprocate therein to engage the hammer in lifting and in percussiverelation; a drill stock slidably and rotatably mounted in the bottom ofthe housing, the stock being provided with a head to rotate in theenlarged portion of the opening in the lower face of the hammer and toreciprocate therein, the stock having a shoulder located below thehammer and arranged to receive,- with the head of the stock, the impactof the hammer; a pinion arranged to rotate with the stock and throughwhich the stock is arranged to reciprocate; means carried by the housingfor restraining the pinion against reciprocation With the stock; andmeans operatively assembling the pinion with the crank shaft forsimultaneously rotating the pinion and the crank shaft.

In testimony that we claim the foregoing as our own, we have heretoaffixed our signatures 1n the presence of two wltnesses.

JOSEPH W. SELLECK. FRED. C. SHARP.

Witnesses:

W. H. HALL, A. L. BREWER.

